With AT & T and Verizon N900A SM-SM-3s N900V Galaxy Note has a locked bootloader whole Android development is really dead, until the release of Safestrap Recovery. By using Safestrap Recovery you can install custom ROMs even with the Galaxy Note 3 has a locked bootloader.

The Safestrap Recovery generate a new "virtual" partition slot where you can install custom ROMs, completely bypassing the bootloader overall process and essentially creating its own "ecosystem" to install the ROM and flash the zip file from the other!

To make things better ever custom recovery allows you to boot multiple ROMS too! You have the option to install as many as four custom ROMS all the Galaxy Note 3 and switch between them whenever you feel like it!